Journal
PHYSICAL REVIEW A
Volume 80, Issue 5, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.80.050303
Keywords
homodyne detection; optical squeezing; phase space methods; quantum gates; shot noise
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Funding
- SCF
- GIA
- G-COE
- MEXT of Japan
- Research Foundation for Opt-Science and Technology
- MIC of Japan
- DFG in Germany
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We demonstrate a quadratic phase gate for one-way quantum computation in the continuous-variable regime. This canonical gate, together with phase-space displacements and Fourier rotations, completes the set of universal gates for realizing any single-mode Gaussian transformation such as arbitrary squeezing. As opposed to previous implementations of measurement-based squeezers, the current gate is fully controlled by the local oscillator phase of the homodyne detector. Verifying this controllability, we give an experimental demonstration of the principles of one-way quantum computation over continuous variables. Moreover, we can observe sub-shot-noise quadrature variances in the output states, confirming that nonclassical states are created through cluster computation.
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